engine TOYOTA T100 1996 Factory Service Manual

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P24212
P24213
A00088
START
IGT (+) For M/T
For A/T
IGT (+)
BE6653
P24215
A00089
ON
START
3 (+)
− DIAGNOSTICSENGINE (3RZ−FE)
DI−107
1996 TOYOTA T100 (RM449U)
6 Disconnect igniter connector and check voltage between terminals IGT of ECM
connector and body ground.
PREPARATION:
Disconnect the igniter connector.
CHECK:
Measure voltage between terminals IGT of ECM connector and
body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
NG Check and replace ECM (See page IN−26).
OK
7 Check voltage between terminal 3 of igniter connector and body ground.
PREPARATION:
Disconnect the igniter connector.
CHECK:
When the ignition switch is turned to ”ON” and ”STA” position,
measure voltage between terminal 3 of igniter connector and
body ground.
OK:
Voltage: 9 − 14 V
NG Check and repair igniter power source circuit.
OK

Downloaded from www.Manualslib.com manuals search engine DI−108
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
8 Check for open and short in harness and connector between ignition switch and
ignition coil, ignition coil and igniter (See page IN−26).
NG Repair or replace harness or connector.
OK
9 Check ignition coil (See page IG−1).
NG Replace ignition coil.
OK
Replace igniter.

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DI−109
1996 TOYOTA T100 (RM449U)
DTC P1335 Crankshaft Position Sensor Circuit
Malfunction (during engine running)
CIRCUIT DESCRIPTION
Refer to DTC P0335 on page DI−66.
DTC No.DTC Detecting ConditionTrouble Area
P1335No crankshaft position sensor signal to ECM with engine
speed 1,000 rpm or moreOpen or short in crankshaft position sensor circuit
Crankshaft position sensor
ECM
WIRING DIAGRAM
Refer to DTC P0335 on page DI−66.
INSPECTION PROCEDURE
Refer to DTC P0335 on page DI−66.
DI0U2−01

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ECM
STA
E1 E4
(M/T) (A/T)
11
E4 11
B−R
Starter IE1
B−R
B−RB−R B−R (M/T)
21 35
Starter
Relay 1
2
W−B (A/T)
IC
B (A/T) W
Park/Neutral
Position Switch
15
B
5
6 B−Y 22
IA3
AM1
W
ALT
BatteryR/B No. 2W−B (M/T)
Clutch
Start
SwtichIE1
B (M/T) B−Y
6 3 W
W
W
14IE1
2
2
2
2
W
DI−11 0
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P1500 Starter Signal Circuit Malfunction
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporazation is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery voltage is ap-
plied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection volume for
the starting injection control and after−start injection control.
DTC No.DTC Detecting ConditionTrouble Area
P1500No starter signal to ECM
Open or short in starter signal circuit
Open or short in ignition swtich or starter relay circuit
ECM
HINT:
In this circuit, diagnosis can only be made in the check mode.
WIRING DIAGRAM
DI984−01

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DI−111
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
HINT:
This inspection procedure is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the matrix chart of problem symptoms on page DI−21.
1 Connect the TOYOTA hand−held tester and check STA signal.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn ignition switch ON and TOYOTA hand−held tester main switch ON.
CHECK:
Read STA signal on the TOYOTA hand−held tester while starter operates.
OK:
Ignition switch positionONSTART
STA signalOFFON
OK Proceed to next circuit inspection shown on
matrix chart (See page DI−21)
NG
2 Check for open in harness and connector between ECM and starter relay
(See page IN−26).
NG Repair or replace harness and sconnector.
OK
Check and replace ECM (See page IN−26).

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W−RB−G
EFI
R/B No.2 22
W
8
EA1 IE1B−G
(M/T)17
B−G (A/T)B−G
(M/T)
E4 E42 1
(M/T)(A/T)ECM
BATT
Battery DI−11 2
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P1600 ECM BATT Malfunction
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for
use by the DTC memory and air−fuel ratio adaptive control value memory, etc.
DTC No.DTC Detecting ConditionTrouble Area
P1600Open in back up power source circuitOpen in back up power source circuit
ECM
HINT:
If DTC P1600 appear, the ECM does not store another DTC.
WIRING DIAGRAM
DI0U4−03

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P24216
P24217
A00090
LOCK
BATT (+)
BATT (+) For M/T
For A/T
FI7107
EFI Fuse
R/B No.2
− DIAGNOSTICSENGINE (3RZ−FE)
DI−11 3
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check voltage between terminal BATT of ECM connector and body ground.
PREPARATION:
Remove the right cowl side trim (See page MF−50).
CHECK:
Measure voltage between terminal BATT of ECM connector
and body ground.
OK:
Voltage: 9 − 14 V
OK Check and replace ECM (See page IN−26).
NG
2 Check EFI fuse.
PREPARATION:
Remove the EFI fuse from the R/B No2.
CHECK:
Check continuity of EFI fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to EFI fuse.
OK
Check and repair harness or connector be-
tween battery, EFI fuse and ECM.

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− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P1780 Park/Neutral Position Switch Malfunction
(A/T Only)
CIRCUIT DESCRIPTION
The park/neutral position switch goes on when the shift lever is in the N or P shift position. When it goes on
terminal NSW of the ECM is grounded to body ground via the starter relay, thus the terminal NSW voltage
becomes 0 V. When the shift lever is in the D, 2, L, or R position, the park/neutral position switch goes off,
so the voltage of ECM. Terminal NSW becomes battery positive voltage, the voltage of the ECM internal
power source. If the shift lever is moved from the N position to the D position, this signal is used for air−fuel
ratio correction and for idle speed control (estimated control), etc.
DTC No.DTC Detecting ConditionTrouble Area
P1780
2 or more switches are ON simultaneously for ”N”, ”2” and
”L” position
(2 trip detection logic)
Short in park/neutral position switch circuit
Park/neutral position switch
ECMWhen driving under conditions (a) and (b) for 30 sec. or more
the park/neutral position switch is ON (N position):
(2 trip detection logic)
(a) Vehicle speed: 70 km/h (44 mph) or more
(b) Engine speed: 1,500 − 2,500 rpm
HINT:
After confirming DTC P1780 use the TOYOTA hand−held tester to confirm the PNP switch signal from ”CUR-
RENT DATA”.
WIRING DIAGRAM
Refer to DTC P1780 on page DI−11 4.
INSPECTION PROCEDURE
Refer to DTC P1780 on DI−11 4.
DI0U5−02

Downloaded from www.Manualslib.com manuals search engine A00646
J/B No.1EA1
3
7
2IGN 1A
8
2
1
W
Battery
W−R
W−R 4 B−R
1C
17B−Y
IG
SwitchB−Y
IA3
W−R
4
AM2
3
2
R−L
W−R
R/B No.2EFI
22 2 225
B−W221 3
EFI
Relay
W−B
EA EB
EA1
9W−R
(M/T)
IE1
W−R
(M/T)
W−R (A/T)12 12
E4 E4
14 24
E7 E7 BR
(A/T) (M/T)
E1 +B
ECM
8
− DIAGNOSTICSENGINE (3RZ−FE)
DI−11 5
1996 TOYOTA T100 (RM449U)
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to the coil, closing the contacts of
the EFI main relay (Making: EFI) and supplying power to terminal +B of the ECM.
WIRING DIAGRAM
DI0U7−03

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P24220
P24221
A00092
ON
E1 (−) +B (+)
E1 (−) +B (+) For M/T
For A/T
DI−11 6
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check voltage between terminals + B and E1 of ECM connector.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−50).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals + B and E1 of ECM con-
nector.
OK:
Voltage: 9 − 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−21).
NG
2 Check for open in harness and connector between terminal E1 of ECM and body
ground (See page IN−26).
NG Repair or replace harness or connector.
OK
3 Check EFI main relay (Marking: EFI) (See page MF−40).
NG Replace EFI main relay.
OK